title: [Ultrastructure and diagnosis of primary hemangiopericytoma in two cases (author's transl)].
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D005260:Female; D006393:Hemangiopericytoma / Q000175:diagnosis / Q000648:ultrastructure*; D006801:Humans; D008297:Male; D008854:Microscopy, Electron; D008875:Middle Aged; D009918:Orbital Neoplasms / Q000175:diagnosis / Q000648:ultrastructure*